J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 812-816.DOI: 10.1016/j.jmst.2018.11.014
Special Issue: High Entropy Alloys 2018-2020
• Orginal Article • Previous Articles Next Articles
Received:
2018-09-10
Accepted:
2018-10-31
Online:
2019-05-10
Published:
2019-02-20
Contact:
Xu Jian
Shao-Ping Wang, Jian Xu. Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation[J]. J. Mater. Sci. Technol., 2019, 35(5): 812-816.
Fig. 1 (a) and (c) Electron backscatter diffraction IPF images, (b) and (d) grain size distributions for the arc-melted TiZrNbTa and TiZrNbTaMo alloys, respectively.
Fig. 2 Representative load-displacement curves under nanoindentation, showing the pop-in events, together with Hertzian fitting analysis as presented by solid lines.
Fig. 4 Plot of cumulative probability of pop-in versus normalized maximum shear stress, τmax/μ, showing that the shear stress at yielding onset is in the range of (1/16-1/12)μ and (1/18-1/14)μ for TiZrNbTa and TiZrNbTaMo alloys, respectively, where μ is the shear modulus of the alloys.
Fig. 5 (a) Linear least-square fitting by first order analysis to extract activation volume from experimental data. (b) Cumulative probability, F, of first pop-ins as a function of pop-in load, P.
Metal | Crystal structure | Crystalline | Processing history | Activation volume (b3) | Ref. |
---|---|---|---|---|---|
g | HCP | polycrystal | as-annealed | 0.2 | [ |
Pt | FCC | single crystal | - | 0.5 | [ |
Cr | BCC | polycrystal | as-cast | 0.3 | [ |
FeCoCrNiMn | FCC | polycrystal | as-annealed | 3 | [ |
TiZrHfNb | BCC | polycrystal | as-annealed | 3-5 | [ |
TiZrNbTa | BCC | polycrystal | as-cast | 1.2 | This work |
TiZrNbTaMo | BCC | polycrystal | as-cast | 1.3 | This work |
Table 1 Activation volume of dislocation nucleation characterized by nanoindentation in typical metals and HEAs.
Metal | Crystal structure | Crystalline | Processing history | Activation volume (b3) | Ref. |
---|---|---|---|---|---|
g | HCP | polycrystal | as-annealed | 0.2 | [ |
Pt | FCC | single crystal | - | 0.5 | [ |
Cr | BCC | polycrystal | as-cast | 0.3 | [ |
FeCoCrNiMn | FCC | polycrystal | as-annealed | 3 | [ |
TiZrHfNb | BCC | polycrystal | as-annealed | 3-5 | [ |
TiZrNbTa | BCC | polycrystal | as-cast | 1.2 | This work |
TiZrNbTaMo | BCC | polycrystal | as-cast | 1.3 | This work |
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